AngularJS – 跟著Google玩網頁!

今天馬老師要與大家分享的是一個前端開發的函式庫AngularJS,前面的文章中都有提到,因為近年來行動裝置的普及讓Javascript大為活躍,不過傳統的Javascript在相容性上、操作上都非常的不方便,所以才有了許許多多Javascript的函式庫與框架的誕生,例如:jQuery、KnockoutJS、GSAP、PaperJS…等,每個Javascript的函式庫和框架的大小、作用和目的都不盡相同,有的是為了特效;有的則是為了方便操作,那今天為何要跟大家分享AngularJS呢?因為…它是名牌!

AngularJS 示意圖

為何說AngularJS是名牌呢?因為目前他是由Google來負責維護。初始版本是在2009年誕生的,比jQuery晚了三年,言下之意就會比jQuery好嗎?當然也不能這麼說,jQuery在目前還是一個非常火燙的前端開發函式庫,應該要說他們兩個在使用的架構和目的上會有所不同,這篇文章也來比較一下同樣的案例,在兩種語法上面撰寫的不同。

AngularJS 官方網頁截圖
AngularJS 官方網頁截圖

不過首先我們要知道基本的AngularJS開發方式,今天的案例我們利用JS Bin的線上開發網頁來說明,大家也可以到這個平台上來試著玩看看!如果需要利用AngularJS開發自己的網頁,也可以到AngularJS的官方網頁把JS下載到資料夾之後引用到網頁裡。

1. 首先點選Add library後選擇AngularJS Stable,這樣該平台就會加入AngularJS的函式庫進入頁面。

AngularJS JS Bin Add Library
AngularJS JS Bin Add Library

2. 在標籤中,加入ng-app的屬性,讓整份文件都可以使用AngularJS。

AngularJS JS Bin 增加 HTML 屬性
AngularJS JS Bin 增加 HTML 屬性

3. 接下來就可以在左手邊body標籤內開始輸入一些程式碼來測試,AngularJS在輸出方面有個基本的結構式「{{ }}」,大家輸入以下的程式碼來測試看看結果:  

<!DOCTYPE html>
<html ng-app>
<head>
	<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script>
	<meta charset="utf-8">
	<title>JS Bin</title>
</head>
<body>
	<p>{{ '馬老師雲端研究室' }}</p>
	<p>35+62={{ 35+62 }}</p>
	<p>NT{{ 62000 | currency }}</p>
</body>
</html>

可以看到輸出的結果應該是:(在JS Bin上面看AngularJS輸出結果

馬老師雲端研究室

35+62=97

NT$62,000.00

同樣的如果我們要利用jQuery來完成這樣的頁面,程式碼就會變成:(在JS Bin上面看jQuery輸出結果

<!DOCTYPE html>
<html>
<head>
	<script src="https://code.jquery.com/jquery-1.11.1.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/numeral.js/1.4.5/numeral.min.js"></script>
	<meta charset="utf-8">
	<title>JS Bin</title>
</head>
<body>
	<p></p>
	<p></p>
	<p></p>
</body>
</html>
<script>
	$("p:eq(0)").text('馬老師雲端研究室')
	$("p:eq(1)").text('35+62=' + (35 + 62))
	$("p:eq(2)").text('NT' + (numeral(62000).format('$ 0,0.00')))
</script>

請注意,為了要完成第三項貨幣型式的呈現,我們還必須去引用這個網站的jQuery Plugin才有辦法比較輕鬆的實現。從上面的案例可以看的出來jQuery是由HTML DOM來抓到對象,再針對對象做操作,而AngularJS不管顯示的效果為何,就是在需要有程式運算的地方出現,所以AngularJS也被稱為符合MVC結構的Javascript函式庫(MVC是一種寫程式的結構,全名是Model View Controller,大家可以上網Google就可以查到很多與MVC相關的資料),但如果你有進入官網,可以看到官網上他的標題是「AngularJS – Superheroic JavaScript MVW Framework」,翻譯成中文大概是「AngularJS是一個符合MV…Whatever什麼什麼隨便啦!的超級函式庫」,可以看出Google的惡搞功夫。

再來示範第二個案例,本案例利用購物行為來製作相關的頁面讓大家參考,程式碼如下:

<!DOCTYPE html>
<html ng-app>
<head>
	<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script>
	<meta charset="utf-8">
	<title>JS Bin</title>
</head>
<body ng-init="stock=120;price=325;quantity=1;total=0">
	<p>馬老師雲端研究室 滑鼠墊</p>
	<p>剩餘:<span ng-model="stock">{{ stock-quantity }}</span>個</p>
	<p>單價:<span ng-model="price">{{ price | currency:"NT$":0 }}</span>元</p>
	<p>數量:<input type="number" min="0" max="{{ stock }}" ng-model="quantity"></p>
	<p>總金額:<span ng-model="total">{{ price*quantity | currency:"NT$":0 }}</span></p>
</body>
</html>

輸出結果:(在JS Bin上面看AngularJS輸出結果

AngularJS JS Bin 輸出結果
AngularJS JS Bin 輸出結果

在這個案例裡面有四個項目,分別是商品剩餘數量、單價、數量、總金額,使用者唯一可以改變的只有數量,但頁面中會自動運算剩餘數量和總金額,其中在語法body標籤中,加上了ng-init屬性,代表設定這幾個項目的預設值,stock(剩餘數量)120個、price(單價)325元、quantity(數量)1個,total(總金額)325元。接下來在span內的ng-model就是去綁定該定義項目,{{  }}則是顯示該項目或運算結果,另外貨幣格式的部分,也是用了一些設定讓貨幣在這個案例裡面顯示得更為接近台幣格式,另外還是用HTML5 input標籤的min和max來限制欄位內的值。 而這個案例如果轉換為jQuery的寫法,大概會是下面這樣子:(在JS Bin上面看jQuery輸出結果

<!DOCTYPE html>
<html>
<head>
	<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
	<script src="http://cdnjs.cloudflare.com/ajax/libs/numeral.js/1.4.5/numeral.min.js"></script>
	<meta charset="utf-8">
	<title>JS Bin</title>
</head>
<body>
	<p>馬老師雲端研究室 滑鼠墊</p>
	<p>剩餘:<span id="stock"></span>個</p>
	<p>單價:<span id="price"></span>元</p>
	<p>數量:<input type="number" min="0" ng-model="quantity" id="quantity"></p>
	<p>總金額:<span id="total"></span>元</p>
</body>
</html>
<script>
	var stock = 120;
	var price = 325;
	var quantity = 1;
	var total = 325;
	$("#stock").text(stock) $("#price").text('NT' + (numeral(price).format('$ 0,0'))) $("#quantity").val(quantity).attr(
		"max", stock) $("#total").text('NT' + (numeral(total).format('$ 0,0'))) $("#quantity").change(function () {
		quantity = $(this).val() newstock = stock - $(this).val() total = price * $(this).val() $("#stock").text(
			newstock) $("#price").text('NT' + (numeral(price).format('$ 0,0'))) $("#total").text('NT' + (
			numeral(total).format('$ 0,0')))
	})
</script>

後記:以上兩個案例示範的是jQuery和AngularJS在撰寫頁面的不同,不過因為這篇文章原本就是要以AngularJS為主,所以挑的案例當然會是AngularJS比較佔優勢的內容,還是跟我常說的一樣,做不同的東西就要用不同的工具,用錯了工具不是做不到,但可能是會事倍功半的!另外文章中的程式碼,都是嵌入遠端的JS檔,所以也可以把整個程式碼複製到你熟悉的網頁開發軟體內,一樣會看到同樣的結果喔!

You may also like...

5,529 Responses

  1. 東進 株価表示:

    Recreational activities could embody arts and crafts, group outings, fitness courses, and leisure events.

  2. Philippe Étienne, newly appointed ambassador of France to the United States, bestowed the National Order of the Legion to Boudreaux, who was surrounded by associates and household, at LDVA’s Jennings, La., dwelling.

  3. There is solely an algorithm running on hardware.

  4. As a substitute, Šesnić argues that the novel suggests a “revision” for domesticity rather than a dissolution.

  5. Aged: 87 yrs 1 mo 26 days.

  6. 海況図表示:

    Their intention is to take the stress out of planning a corporate or wedding ceremony occasion by taking a step ahead of the market.

  7. Nonetheless before you purchase handbags online India there are certain aspects to take care of.

  8. Sophia (1769-1841) was invited to attend Martha Washington’s first public occasion in Philadelphia.

  9. The Sith Eternal cultists are disintegrated in the explosion following Sidious’ dying.

  10. Erie individuals west and northwest by means of the gaps of the Allegheny in jap Ohio and northwestern Pennsylvania (between the upper Allegheny River and Lake Erie), as nicely because the 5 Nations of the Iroquois, one other Amerindian confederation eastwards from the right bank of the Genesee River by means of the Finger Lakes region of higher New York down the St.

  11. Flagstaff lies on the southern edge of the Colorado Plateau, and is largely limestone beneath San Francisco volcanic discipline.

  12. She was a member of Jap Star and Crestwood Baptist Church.

  13. With regards to Rajasthan and Gujarat the brides and can be brides put on ivory bangles or chooda for the aim.

  14. Six to twelve months earlier than the marriage is also an appropriate window to hire a Destination Marriage ceremony Planner in Delhi, but it might require some flexibility with dates and venues.

  15. The National Weather Service office in Mount Holly, New Jersey, logged over 250 wind harm studies in the region ensuing from the derecho, most ensuing from felled timber and downed energy strains, some of which collapsed on buildings and residences.

  16. After Momin’s spirit possessed the our bodies of two thieves, the others have been pressured to abandon them and blow up the ship, seemingly destroying Momin’s mask, and his spirit with it.

  17. Once more it is like that chilly Chawter, again that chilly air.

  18. After Sidious’ dying and the fall of the Empire, Snoke grew to become the Supreme Chief of the primary Order and seduced Ben Solo to the dark side, coaching him to turn into his apprentice, Kylo Ren.

  19. Two promising strains of play suggest themselves.

  20. Кто ты есть на самом деле? В чем твое предназначение?
    В каком направлении лежит твой
    путь и как тебе по нему идти?

    Дизайн Человека расскажет об этом!

    – Помогает принять свои особенности – Даёт конкретные рекомендации по принятию решений – Приносит
    чувство согласия с собой – Укрепляет доверие к
    себе – Помогает принять свои особенности – Даёт конкретные рекомендации по принятию
    решений – Помогает понять свои природные таланты и способности
    – Снимает давление социальных стереотипов
    – Снимает давление социальных стереотипов

    Типы, Авторитет, Профиль, Центры, Каналы,
    Ворота, Планеты. Тип Личности

  21. Hiring an event management company is definitely the perfect option and each shopper needs are cared for separately.

  22. In this text, season and episode numbers are first listed based on air dates by the Canadian distributor (Corus Entertainment), and the corresponding HGTV numbers comply with in parentheses.

  23. Oisfxx表示:

    гѓ—гѓ¬гѓ‰гѓ‹гѓійЂљиІ© – イソトレチノイン её‚иІ© гЃЉгЃ™гЃ™г‚Ѓ イソトレチノイン гЃЇйЂљиІ©гЃ§гЃ®иіј

  24. peelerie.com表示:

    Good post. I absolutely appreciate this site. Keep it up!

  25. When I initially commented I appear to have clicked on the -Notify me when new comments are added- checkbox and now whenever a comment is added I get four emails with the same comment. Perhaps there is an easy method you are able to remove me from that service? Thanks a lot.

  26. BOOSTARO表示:

    Great article. I found the details very beneficial. Loved the manner you clarified all the points.

  27. Great post. I thought the details highly useful. Appreciated the method you clarified the content.

  28. This post is wonderful! Full of helpful information and very articulate. Thanks for offering this.

  29. Survivors include two brothers, Ernest Harris of Little Rock and Earl Harris of Olden, Texas.

  30. The reason is that in this type of play, use of reference books is allowed, and plenty of hours might be spent on a single move.

發佈留言

發佈留言必須填寫的電子郵件地址不會公開。